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Ethylene Bis Stearamide: Improving the Surface Finish of Injection Molded Parts

by:Sainuo     2023-09-12

Ethylene Bis Stearamide: Improving the Surface Finish of Injection Molded Parts


Ethylene Bis Stearamide (EBS) is a widely used additive in the field of injection molding. Its primary function is to enhance the surface finish of molded parts, ensuring they maintain a high level of quality and aesthetics. This article will explore the various aspects of EBS, its properties, benefits, and applications in injection molding.

Understanding Ethylene Bis Stearamide (EBS)

EBS is a synthetic wax compound that consists of ethylene bis, derived from ethylene diamine, and stearic acid. It is usually formed by the reaction of these two compounds in the presence of heat and pressure. The resulting white powder or solid material has a high melting point, typically ranging between 141掳C to 146掳C (286掳F to 295掳F). Due to its composition, EBS exhibits excellent thermal stability and compatibility with various polymers used in injection molding processes.

Benefits of Using EBS in Injection Molding

1. Enhanced Surface Finish: One of the primary advantages of incorporating EBS in injection molding is the improvement it brings to the surface finish of the final parts. The addition of EBS helps reduce any surface imperfections such as flow lines, sink marks, or weld lines. It provides a smoother and more visually appealing appearance to the molded components.

2. Friction Reduction: EBS acts as a lubricant, reducing friction during the injection molding process. By reducing internal friction, the compound enables better flow of the molten polymer within the mold cavity. This improved flow leads to a reduction in internal stresses and, in turn, minimizes the possibility of warpage or deformation in the molded parts.

3. Release Agent: EBS also serves as a release agent, preventing the plastic component from sticking to the mold after solidification. This property is particularly beneficial when molding complex or intricate shapes, as it ensures easy separation of the part from the mold. As a result, it facilitates faster production cycles and reduces the probability of damaging the molded parts during the demolding process.

4. Improved Mold Filling: With EBS, the polymer melt exhibits lower viscosity, which improves its flowability and enables more efficient mold filling. This attribute is advantageous, especially when molding thin-walled or complicated parts with intricate geometries. The reduced viscosity allows the material to reach all nooks and corners of the mold, resulting in better replication of fine details and achieving higher dimensional accuracy.

5. Cost Savings: Another significant benefit of EBS is its potential for cost savings. As EBS enhances mold release properties, it reduces the need for additional release agents or mold maintenance. It also reduces the occurrence of rejected parts due to surface imperfections, leading to higher overall production efficiency and cost-effectiveness.

Applications of EBS in Injection Molding

1. Automotive Industry: EBS finds extensive use in injection molding applications within the automotive industry. It is utilized for producing interior components such as dashboard parts, door panels, and trim pieces. The use of EBS ensures that these parts possess a smooth and visually appealing surface finish, meeting the high-quality standards of the automotive sector.

2. Consumer Electronics: In the consumer electronics industry, where aesthetics and precision are crucial, EBS is widely utilized. It aids in the production of plastic casings, covers, and enclosures for devices such as smartphones, laptops, and televisions. The inclusion of EBS guarantees a flawless surface finish, enhancing the overall visual appeal of the products.

3. Medical Devices: Medical device manufacturers rely on EBS to achieve superior surface finishes in their injection-molded products. EBS is used to mold components like syringes, surgical tools, and various other medical equipment. The smooth finish provided by EBS makes these instruments easier to clean, reducing the risk of contamination and ensuring patient safety.

4. Packaging Industry: EBS plays a vital role in the production of injection-molded packaging items. It enhances the surface quality of packaging containers, caps, bottles, and closures, making them aesthetically pleasing and tactilely appealing. Additionally, the improved mold release properties of EBS aid in faster production cycles, catering to the high demand and rapid turnover in the packaging industry.

5. Industrial Applications: EBS is also employed extensively in various industrial applications, including manufacturing components for machinery, appliances, and tools. In these sectors, EBS helps achieve an excellent surface finish and dimensional accuracy, ensuring the functionality and durability of the end products.


Ethylene Bis Stearamide (EBS) is a versatile additive that significantly enhances the surface finish of injection-molded parts. Its ability to reduce surface imperfections, act as a release agent, and improve mold filling makes it an indispensable component in the field of injection molding. Through its application, industries such as automotive, consumer electronics, medical devices, packaging, and general manufacturing can achieve high-quality molded products with improved aesthetics and dimensional accuracy. As EBS continues to evolve and find new applications, it is set to play an increasingly vital role in the injection molding industry.

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